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Structural Engineering and Mechanics
  Volume 84, Number 6, December25 2022 , pages 743-765
DOI: https://doi.org/10.12989/sem.2022.84.6.743
 


PLAXIS 3D simulation, FLAC3D analysis and in situ monitoring of Excavation stability
Lei Zhou, Zahra Jalalichi, Vahab Sarfarazi, Hadi Haeri, Parviz Moarefvand, Mohammad Fatehi Marji and Shahin Fattahi

 
Abstract
    Near-surface excavations may cause the tilting and destruction of the adjacent superstructures in big cities. The stability of a huge excavation and its nearby superstructures was studied in this paper. Some test instruments monitored the deformation and loads at the designed location. Then the numerical models of the excavation were made in FLAC3D (a threedimensional finite difference code) and Plaxis-3D (a three-dimensional finite element code). The effects of different supporting and reinforcement tools such as nails, piles, and shotcretes on the stability and bearing capacity of the foundation were analyzed through different numerical models. The numerically approximated results were compared with the corresponding in-field monitored results and reasonable compatibility was obtained. It was concluded that the displacement in excavation and the settlement of the nearby superstructure increases gradually as the depth of excavation rises. The effects of support and reinforcements were also observed and modeled in this study. The settlement of the structure gradually decreased as the supports were installed. These analyses showed that the pile significantly increased the bearing capacity and decreased the settlement of the superstructure. As a whole, the monitoring and numerical simulation results were in good consistency with one another in this practically important project.
 
Key Words
    excavation; field measurements; FLAC3D; nail; pile; Plaxis 3D; shotcrete
 
Address
Lei Zhou: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Failure Mechanics and Engineering Disaster Prevention, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
Zahra Jalalichi: Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran
Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
Hadi Haeri: Department of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran
Parviz Moarefvand: Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran
Mohammad Fatehi Marji: Department of Mining Engineering, Yazd University, Yazd, Iran
Shahin Fattahi: Department of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran
 

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